﻿// Copyright (c) 2009, James Killick
// http://code.google.com/p/kosher/
// All rights reserved.

// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions are met:

//     * Redistributions of source code must retain the above copyright notice, 
//       this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright notice,
//       this list of conditions and the following disclaimer in the documentation
//       and/or other materials provided with the distribution.
//     * Neither the name of the Kosher team nor the names of its contributors may 
//       be used to endorse or promote products derived from this software without 
//       specific prior written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;

namespace Kosher
{
    static class Guard
    {
        public static void ArgumentNotNull<T>(T value, string parameterName)
        {
            if (Equals(value, null))
            {
                throw new ArgumentNullException(parameterName);
            }
        }

        public static void NotNull<T>(T value, string message)
        {
            if (Equals(value, null))
            {
                throw new NullException(message);
            }
        }

        public static void ArgumentNotNullOrEmpty(string value, string parameterName)
        {
            if (string.IsNullOrEmpty(value))
            {
                throw new ArgumentNullException(parameterName);
            }
        }

        public static void IsTrue(Func<bool> func, Action action)
        {
            if (!func())
            {
                action();
            }
        }
    }
}
